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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e76185330c4def8beabe85c98a53afaed98d16f33ae634cf785a21b5a13364' 
  AND token = 'x2jB2jHBz9r0E4qvO3JDurtQvub8pJLmB94pgL2giUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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