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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28edea7fb0554d0a7696cf90896a1d57803fdaf865ab92682d6fd56fe76442c' 
  AND token = 'YfgadIYDCuB9x5i/asqXAp5pDZlImXmZdpJWVcimgo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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