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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6f843e9a7e9877e989579b602ac310bd6cd3a0172e0880277a46ac92395628' 
  AND token = 'L2Dz1E6qdYbK2vcm4QE3L9qRvrAgCk+1IWaXn+GIMX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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