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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee964568c4248fc1c54036d6823f005c07f56c50f68c13237da6f44621e28856' 
  AND token = 'nT86SfmY1n+0XiXggrBOOb+Z3fw+CzY4UMIJlPgZj2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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