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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e19cd765b50249cdce756a1efc5276ef04ca9325b0ed0d80e7ff1d4335fffd9' 
  AND token = 'qUDjnnMwNd2WTc7YaXr14MDNFG6szM8yjBDwvZM9rZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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