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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0300e8633895743ae28a86a1e104740386ed9d347d4a03e155bdff9f1ce61ee1' 
  AND token = 'XIKI06IoFxbvq+dJO1q+AoqHd1r1vyuZZA6ODOYCO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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