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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19678c26edc0a49b4d61624b41de98b9a49b36a6791983e0a25ac2b5c57ee63' 
  AND token = 'sTy3HqOBXCJX90ab4doAwVlHxcQPGDkvudmHmdF/3/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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