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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f2300b141b9c0980f33f7bcd3a3fb539ed448a5c74ea30fed01f0dfe2aa69c' 
  AND token = 'OlWmGknCMYxxt5uSwSMIhcJLHXo+J5rk0tDKfMXUn7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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