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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9d1cbf4740fb967b2ee0b1078582afbefc20bf636991f838a2a492cf8358be' 
  AND token = 'eY70WqgB1Odqvz28MXlWIrhQ5652i2OcVJjfxofio24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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