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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1685bbb5efcc193b02e73455461a9d20264f99a155e7df357048519e5095fb92' 
  AND token = 'TTMzZ908bs0FneagJY6JN8+5wnK8Q+YwofWfrGC2IQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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