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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c0e08bea96d7933a99c08ccd6ffea60cb3b6edcc17437b5d9b4dec1991d2bb' 
  AND token = 'hVT85zHmFyJI87OUKFs63aF1sCM3dI5fFxK8+xER9N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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