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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd5ca0f17944b7745f3b09c8bc989d90c16e55b0684b002fec188e99e7bc72b' 
  AND token = 'q/vRakr8CWSiBZos7QQ68rWEPjtTV1J8gi0XxoWgIsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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