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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf46fca906538f47954be55da068cf5907593f0bf0060f38a69b2eb3c2f6d21' 
  AND token = '4jaQnGq4C4wK2CTWO6Ye0nOvgcuCKhqAIO5rWuELvFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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