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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96d1c5e042b08d87f8ad14b504b07b7adfc1c5ddd4f5fea73c53d93520caf8e' 
  AND token = 'jIIg5+Pe6RH9S/XjATj7vCdo/pNA7wTEevxRKaI1B7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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