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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30dd0dacd5ee193ca4701153fcc5163fd79a26b9c369d23f0b2934ea120ff9a3' 
  AND token = 'X0Kt80TV8VKF1T1wS1x4fyEvlkNqQTOlXZL/4USVmXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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