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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7772727e83436a4f9625d72aa8062dff414ca728eb4dd3067a8fa7716c70d4' 
  AND token = 'XibI/w7drBGzInb78m6Vu7L1Q2ZsByAhw8Ifb+FUFek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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