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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d6a6f6473366d55fcee4552758c5740346d4199273cf7ad7eb099eda2946db' 
  AND token = 'Lu0rLZTCSLzEtPGMC90xVYeYyfukEDi9WBd/3mSv7u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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