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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40fdf259c3107170f9d3d3c3a7830fb6ea30d772e78d8e84a31ec5e1b39b8997' 
  AND token = 'A45dihPkdf3kAerxl6sZxbCt5LXG1K9/dxzfoVv9kdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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