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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c90671a2cc660c708ae122c50a17f6d69f6e5c32844fb7ba2fa965789f799b' 
  AND token = '32/85jQfZW2CuBEVZXNepZnwuCuieQvtNlt/YH95Epo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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