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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f7ce6469f9c5e8162ec56bd22fe905e80d9e63db1130f320d8435a501dbe67' 
  AND token = '8bjOOYie0nx6g1MVdMbYzvEkfgLkYF8gmtIayGUjakQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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