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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ef39b8b2612c9816ae802f2629a2118df9f24c81e3534163eccb742d1a80d5' 
  AND token = 'yfs476O/H9pl5RltUdkDTEzP4UUTC6WIz6nSngAW5rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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