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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aaf94cf8f07f52e6960a92d39a410eebb1683819b56632281901353fc0990a' 
  AND token = '1z48VMC+dov0W1NjfZWUfHyFp/cJf8ap3aSA29si/z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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