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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d76b7ced09b726dfa6eadb8b6f1c637e64675218f54ebb31126c32acaab09be' 
  AND token = 'lCxuI4bC7z7YuzP9wJyW6pAHL5RTRxiwu2XplUdzGms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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