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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca86c42497b7ddd4de46464467cb1664b064e6ac060fdee6c4f5e8eef4a5abb' 
  AND token = 'K4QF5QDhPjPebkXNBQseQJYh4v0ve04u+92NS+Lk4Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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