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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1855777b56028c56d319b31cddd9e4f7cf736a97569b0e06c677b1e79c4b7156' 
  AND token = '5NjrVjXqaSN71/6QZZDhc9f6UHf76aUJAfcqtyvf+9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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