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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b18eabded01702a602514a250ada262b3a5e3d26535f2c1b8bcef9df4244e6' 
  AND token = '4zU3eLjwp6dKzziSp3H115WRFnpJ2DLQVLfV8t3F3YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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