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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7947495f521ba816283ed86084a576123230cae27de03ebe3b8bc6c06de5f813' 
  AND token = '8FthLq1qBJg1rmeFq1piiJnq2qxuEGsMY/O4Nkznhsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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