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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbf1cff1233420b98dc272dacaa9f63e674515f55d9f18e4e83502f1fcf0376' 
  AND token = 'xZe9McrtFa1dc5PWY4dBhjA9Ph8aIOGqqy9L1VrO/9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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