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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b295caa6ad52198f388602643f4bdb9676c5c4e4cc67a4cd5c01871287f493a' 
  AND token = 'jw5MklRKcnLkSOpNQURsj5KrGrQ36e5Ve7OMCu4iISQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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