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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b110c1cd7d32126ad6533c357e79c8ccc5df9ee0ae9344dacc7b632ef69a0a' 
  AND token = 'Qkt9dHUtCl5hUDerS2Hxng8esBEo5b4TxCCT5zQKsU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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