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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096e3dbaf290519f53db7c081cee5c6f33b4cd9a61d4cea3df0940f1449023cd' 
  AND token = 'vPdaPx9C58bKzuVCzEcRPgU/plk16EU3av2B2zxnc+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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