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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9988a63b3afdf6509a88d58e4717baf438a38a265b7ad3ee9df88cf2539268a2' 
  AND token = 'uhhk1P1t/z6uPWs82jJjZPy1+FV2Hk0hyTmVyWpNHG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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