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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f174b412185d8114aa1dd3acf661be571cbc4ab1a93c1bb2db45790c5ea99b3d' 
  AND token = 'SAHkEgDE30etgGz+oSusSqm7gp8/eVaNFIWa5/2pVmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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