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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678702b9d15b89a9d01398a2187d6b227114feab53eff423b46add0646191366' 
  AND token = 'obJTH4E5hq0jqWDivZ7Fymylc6rUpL8TVXFjbwS7uUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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