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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e0ee84dfe465c54ee05b0164b9ad7672dd0d7f2e254d8e0d367eb49460990e' 
  AND token = 'gB69y9WA7Ia/dfUICwK70hSIqPsdAqXdNayx102msvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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