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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda4500b0fb198195837a77ce137a04cd403fffa4f264a22a5f41d4b1db9375f' 
  AND token = 'CR9K/vc1N4cU5Dnlbqhfz9Zt+lRGfdCBkw3LqruTx8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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