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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14046080ad079a22951e6efbba0d237ea375b265aa5d952d573b5754893aece4' 
  AND token = '1MRugxxQNweGznXZBUD/9yeaXTSlO7eNcoujfHkf1fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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