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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602c5b07944988ddb49d3a8b46399ca582ff6ac557258e02aece6d98663f36b6' 
  AND token = 'Pw0kwfNAfQNDCD2NTecgBTdq58NxASUOZ806hgOjkHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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