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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0223ba2902ec6363689d76f6de566b0dc971091daa83321f8fa627119ce1aa36' 
  AND token = 'mN7zZParDE936zLYiSE4UbKS4MljQQFv8ZUW0PvtNjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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