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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3b89c154e15a726d31d971f1695209725aa183b7b67b8f132d6b0e6483473fc' 
  AND token = 'xL8stI2t19jqGnj2uLN4eqO5twMIoK6+VX1sa2vj3NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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