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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2576531db653e7ce3dbb6d6f5859e02575485b508eeaaaf11a6031bbfe6624fa' 
  AND token = 'JOYEcz6BqBqHPGW9DZBiukvJay/dmD8z4mhASIC2dM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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