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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336eb74b504ce6c2acc892686e58413fbee7aaa08720efbd80e53dd6e26c4643' 
  AND token = 'g5/UP5LwUaQI0fOiYj6Jcv5nvvL3gOsyAjgW6Mfj9qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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