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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba63431bbc5c42c14f1222e6557bcb5f1a00e7798252c6c1ef81f3ac6d8c297' 
  AND token = 'K9i/GWpKnKaFpC2zcRafyLhGAvm3wjeUXlUdphb45UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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