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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498996b5410a0c9381be98cdcd798c2f9984d96e2f0cf8aa2016c06bf4ea05f6' 
  AND token = '2QjklVfajPFCL0y7J97V5/xLl9SZR/5wy+ckktCcWaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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