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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f64ddb7459a30ba9d73aa68091933d0164c851ca1cfb3c90828312c464877c1' 
  AND token = 'yp4Uqkc2weeW7a7hF4JDKhA2SRd5yPrHPuHzW0VBYls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}