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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab33ab7ca6ce7ee37c6a3614d887af15f9e0217876fb64a4bb78fba8474eb3f0' 
  AND token = 'GK+LOjlHYv7zO30dCKJX0EwA7KKjMldiuqEcqFp3cfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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