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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401a098b0d8e79a31002f3cf2bb915cb2c0b40ea4bbf77f1342d42ebba8878f1' 
  AND token = '+aw90upcaVN5gjEjYs9lYCIfCtPo7sWFfLAYtn86Smo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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