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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc29c4d5e34417782ccc87d38009a542bae0104f761df4741c966356730279b' 
  AND token = '1wHJtcO4+4TFUynKVS0q7ol08G/nVssNO6Q+pnVKrZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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