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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b07d8d07a20240acf33441a6b88b867c3acf69a83b03474450264ee0c85390a' 
  AND token = 'yWAysHOw3CXJoUI36f86zFk3nGlaCuDs0GlaYDlKCYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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