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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c07a89ee01ccc584cd7741f487c79b3f834db89bb6e5a8bab31dece81590ff' 
  AND token = 'rnxb1ZUQWM8a8QeJwXXTFQDipgb3re6DgQ0SX0dwzjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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