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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0778fc1aac8bcd077c0cc5da7b4484a10f54210c47cda2e21e54ffd1c5915a6f' 
  AND token = '2gv2+r7nUEL6hfXSxAyHmXnceeaMMbR/dS5DcBC6Fpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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