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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f490fada5ab97c62a43b0ac43a6d218108b86536fc2f3eb74fafcee71eac86' 
  AND token = 'eL3eO+LXouzHhPeAzGBAX6j/dMa6wXqIYDKcFyz4hYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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